diff --git a/drivers/md/md.c b/drivers/md/md.c
index 16b0822fa24a8d1990deb11bf454628922ebec5e..a2678d882151aa751123eb3203b7098e93fc431c 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1180,7 +1180,7 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
 			mddev->bitmap_info.offset =
 				mddev->bitmap_info.default_offset;
 			mddev->bitmap_info.space =
-				mddev->bitmap_info.space;
+				mddev->bitmap_info.default_space;
 		}
 
 	} else if (mddev->pers == NULL) {